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Professional and personal files including Armstrong's correspondence with professional associations, other engineers, and friends, his research notes, circuit diagrams, lectures, articles, legal papers, and other related materials. Of his many inventions and developments, the most important are: 1) the regenerative or feedback circuit, 1912, the first amplified radio reception, 2) the superheterodyne circuit, 1918, the basis of modern radio and radar, 3) superregeneration, 1922, a very simple, high-power receiver now used in emergency mobile service, and 4) frequency modulation - FM, 1933, static-free radio reception of high fidelity. More than half the files concern his many lawsuits, primarily with Radio Corporation of America, over infringement of the Armstrong patents. Litigation continued until 1967. Other files deal with his work in the Marcellus Hartley Research Laboratory at Columbia University, 1913-1935, and with the American Expeditionary Forces in France during World War I, his Air Force contracts for communications development, Army research during World War II, the Radio Club of America, the Institute of Radio Engineers, FM development at his radio station at Alpine, N.J., the use of FM in television, his involvement in Federal Communications Commission hearings and legislation, and his work with the Zenith Radio Corporation. Also, letters to H.J. Round

Correspondence, manuscripts, documents, notes, photographs, transcripts of historical documents, and printed materials. Larson's correspondence consists of professional correspondence relating to historical research; his work at the United States National Archives, including correspondence with Philip Hamer while preparing a special survey of archival materials in the U.S. Virgin Islands under a Works Progress Administration grant, 1936-1937; genealogical research; and personal correspondence with family and friends. Manuscripts by Larson relate to Alexander Hamilton, Bjørnson, Bjørnstjerne, Danish National Archives, archival research in the U. S. Virgin Islands, and the U.S. Army activities in Korea and in the Virgin Islands.

Wesley McCune founded Group Research Inc. in 1962 after a successful career as a journalist for such magazines as "Newsweek", "Time", "Life", and "Changing Times. Group Research Inc. was based in Washington DC until ceasing operations in the mid-1990s. The organization collected materials that focus on the right-wing and span four decades. The archive includes information about and by right-wing organizations and activists in the form of publications, correspondence, pamphlets, reports, the newspaper "Congressional Record," and magazine clippings and other ephemera. McCune and his small staff also published an initially bi-monthly but in later years monthly newsletter Group Research Report which kept its subscribers abreast of the latest views and actions of right-wingers.

The Ferenc Nagy Papers consist of correspondence, manuscripts, subject files and printed materials relating to Nagy's career and family. The earliest materials cover the period 1945 to 1947 when Nagy was leader of the Hungarian Smallholders' Party, and later Prime Minister of Hungary.

Papers concerning both the administration of the Henry Street Settlement and Wald's involvement in numerous philanthropic and liberal causes. Her office files trace the foundation and growth of the Henry Street Settlement from 1895 until 1933. Her other activities include child welfare, civil liberties, immigration, public health, unemployment, and the peace movement during World War I. The correspondence files contain letters from public figures and writers including Jane Addams, Roger N. Baldwin, Van Wyck Brooks, Lavinia L. Dock, John Galsworthy, Samuel Gompers, William D. Howells, Charles Evans Hughes, Mabel Hyde Kittredge, Frances Perkins, Dorothy Thompson, Norman Thomas, Ida Tarbell, Margaret Sanger, and Jacob A. Riis.

Minutes, correspondence, annual reports, press releases, financial records, photographs, memorabilia, audiovisual, digital and printed materials document the philanthropic activities and administration of the Carnegie Corporation of New York. The collection is actively growing, primarily through regular document transfers from the Carnegie Corporation of New York. Andrew Carnegie's biographical information and personal philanthropic activity can be found in Series VII. In addition, his pre-1911 gifts, most notably his donations for libraries and church organs, can be found on microfilm (Series II), in the Home Trust Company Records (VI.A), and Financial Record Books (I.C.1). Grant files (Series III.A), which comprise the bulk of the collection) provide information on projects and institutions founded, endowed or supported by the Corporation. The Special Initiatives series (Series IV) contains the records of task forces, commissions and councils, formed by the Corporation mostly during the 1970s, 1980s, and 1990s to address specific issues. The Corporation's records include those of other Carnegie philanthropic organizations (Series VI), including the Carnegie Foundation for the Advancement of Teaching and the Home Trust Company, both of which shared staff, officers, and office space with the Corporation for a period of time.

The General Manuscript Collection is an artificial collection of correspondence, diaries, lecture notes, class work, essays, administrative documents, minutes, and other documents collected by the Rare Book & Manuscript Library. Single items or very small collections are generally classified as part of the general manuscript collection rather than assigned an individual manuscript number. Additionally, small additions to existing RBML manuscript collections may be classified as part of the General Manuscript Collection.

Correspondence, speeches, reports, testimony, press releases, and articles of Young. The files document Young's leadership in many social welfare and civil rights organizations, as well as his activities as a columnist and speaker. Cataloged correspondents include Robert F. Kennedy, Lyndon B. Johnson, Hubert H. Humphrey, Martin Luther King, Jr., Coretta Scott King, Roy Wilkins, and John W. Gardner.